Del bodegón a la basura. Representaciones de alimentos en la historia del arte desde la perspectiva de la fotografía contemporánea

El artículo habla de la representación de alimentos en la Historia del Arte; estudia porqué las representaciones de comida tradicionalmente han sido consideradas como un género menor y plantea la hipótesis de su revitalización en el mercado del arte contemporáneo a través de la fotografía. Mediante el análisis de imágenes de comida en diferentes épocas, el texto explica que los bodegones casi siempre han sido símbolos de la superabundancia, presentando fundamentalmente alimentos, y en algunas ocasiones desperdicios. Continúa con la idea de que las sobras en las antigüedad eran orgánicas y sin embargo, en la actualidad los still life se han convertido en representaciones de basura, de desechos, y desperdicios en todas sus acepciones. El texto demuestra, mediante el análisis de algunas obras contemporáneas fotográficas, que el tema de la comida hoy es mucho más relevante de lo que la crítica de arte argumentaba en el pasado. Las imágenes de objetos conforman un sistema de representación y significado en continua evolución que es el reflejo de nuestra cultura. Estas fotografías nos hablan de sociología, política y economía mostrándonos en la actualidad el impacto que está sufriendo el medioambiente debido a nuestras rutinas cotidianas.

Strength of the Iberian intraplate lithosphere: Cenozoic deformations and seismicity

Previous studies about the strength of the lithosphere in the Iberia centre fail to resolve the depth of earthquakes because of the rheological uncertainties. Therefore, new contributions are considered (the crustal structure from a density model) and several parameters (tectonic regime, mantle rheology, strain rate) are checked in this paper to properly examine the role of lithospheric strength in the intraplate seismicity and the Cenozoic evolution. The strength distribution with depth, the integrated strength, the effective elastic thickness and the seismogenic thickness have been calculated by a finite element modelling of the lithosphere across the Central System mountain range and the bordering Duero and Madrid sedimentary basins. Only a dry mantle under strike-slip/extension and a strain rate of 10-15 s-1, or under extension and 10-16 s-1, causes a strong lithosphere. The integrated strength and the elastic thickness are lower in the mountain chain than in the basins. These anisotropies have been maintained since the Cenozoic and determine the mountain uplift and the biharmonic folding of the Iberian lithosphere during the Alpine deformations. The seismogenic thickness bounds the seismic activity in the upper–middle crust, and the decreasing crustal strength from the Duero Basin towards the Madrid Basin is related to a parallel increase in Plio–Quaternary deformations and seismicity. However, elasto–plastic modelling shows that current African–Eurasian convergence is resolved elastically or ductilely, which accounts for the low seismicity recorded in this region.

Upper-Pleistocene terrace deposits in Mediterranean climate: geomorphological and source-rock control on mineral and geochemical signatures (Betic Cordillera, SE Spain)

Mineral and chemical composition of alluvial Upper-Pleistocene deposits from the Alto Guadalquivir Basin (SE Spain) were studied as a tool to identify sedimentary and geomorphological processes controlling its formation. Sediments located upstream, in the north-eastern sector of the basin, are rich in dolomite, illite, MgO and KB2BO. Downstream, sediments at the sequence base are enriched in calcite, smectite and CaO, whereas the upper sediments have similar features to those from upstream. Elevated rare-earth elements (REE) values can be related to low carbonate content in the sediments and the increase of silicate material produced and concentrated during soil formation processes in the neighbouring source areas. Two mineralogical and geochemical signatures related to different sediment source areas were identified. Basal levels were deposited during a predominantly erosive initial stage, and are mainly composed of calcite and smectite materials enriched in REE coming from Neogene marls and limestones. Then the deposition of the upper levels of the alluvial sequences, made of dolomite and illitic materials depleted in REE coming from the surrounding Sierra de Cazorla area took place during a less erosive later stage of the fluvial system. Such modification was responsible of the change in the mineralogical and geochemical composition of the alluvial sediments.